![]() It was derived by George Gabriel Stokes in 1851 by solving the Stokes flow limit for small Reynolds numbers of the Navier–Stokes equations. ![]() A high viscosity index ensures consistent lubricating properties across a. The newton-second per square meter (N s m-2) and the pascal-second are the other units (Pa s.) ML-1T-1 is the dimensional formula for viscosity. Viscosity is measured in Poiseuille, a SI unit of measurement (PI). The higher the viscosity index, the lower the viscosity change of an oil at fluctuating temperatures. The ratio of shearing stress to velocity gradient in a fluid is used to calculate viscosity. ![]() In fluid dynamics, Stokes' law is an empirical law for the frictional force – also called drag force – exerted on spherical objects with very small Reynolds numbers in a viscous fluid. The viscosity of oils and base oils of lubricating greases from Klber Lubrication can be determined by means of the known kinematic viscosity at 40 C and 100 C. Not to be confused with Stokes' theorem in vector calculus, or Stokes shift in luminescence and Raman spectroscopy. ![]()
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